function z=mapping(y,NRB,Cell_ID)
k_=(12/2)*(mod(Cell_ID,2*NRB));
k(1)=k_;
k(2)=mod(k_+floor(NRB/2)*12/2,NRB*12);
k(3)=mod(k_+floor(2*NRB/2)*12/2,NRB*12);
k(4)=mod(k_+floor(3*NRB/2)*12/2,NRB*12);

j = 1;
for i=1:4
   for ii=1:4
    Pos(i)=k(i)+pos(ii);
    pos=[0,1,2,3];
   end
    z(Pos(1),1,:)=y(j);
    PCFICH_mappingid(Pos(1),1)=1;
    z(Pos(2),1,:)=y(j+1);
    PCFICH_mappingid(Pos(2),1)=3;
    z(Pos(3),1,:)=y(j+2);
    PCFICH_mappingid(Pos(3),1)=4;
    z(Pos(4),1,:)=y(j+3);
    PCFICH_mappingid(Pos(4),1)=6;
    j = j + 4;
end;